linux-ext4 - [PATCH] setup_tdb : fix memory leak

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Date:   Tue, 30 Nov 2021 14:40:38 +0800
From:   zhanchengbin <zhanchengbin1@...wei.com>
To:     Theodore Ts'o <tytso@....edu>
CC:     <linux-ext4@...r.kernel.org>, <liuzhiqiang26@...wei.com>,
        <linfeilong@...wei.com>
Subject: [PATCH] setup_tdb : fix memory leak

In setup_tdb(), need free tdb_dir before return,
otherwise it will cause memory leak.

Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
Signed-off-by: zhanchengbin <zhanchengbin1@...wei.com>
---
  e2fsck/dirinfo.c | 13 +++++++++----
  1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/e2fsck/dirinfo.c b/e2fsck/dirinfo.c
index 49d624c5..a2b36d8e 100644
--- a/e2fsck/dirinfo.c
+++ b/e2fsck/dirinfo.c
@@ -49,7 +49,7 @@ static void setup_tdb(e2fsck_t ctx, ext2_ino_t num_dirs)
  	ext2_ino_t		threshold;
  	errcode_t		retval;
  	mode_t			save_umask;
-	char			*tdb_dir, uuid[40];
+	char			*tdb_dir = NULL, uuid[40];
  	int			fd, enable;

  	profile_get_string(ctx->profile, "scratch_files", "directory", 0, 0,
@@ -61,11 +61,11 @@ static void setup_tdb(e2fsck_t ctx, ext2_ino_t num_dirs)

  	if (!enable || !tdb_dir || access(tdb_dir, W_OK) ||
  	    (threshold && num_dirs <= threshold))
-		return;
+		goto error;

  	retval = ext2fs_get_mem(strlen(tdb_dir) + 64, &db->tdb_fn);
  	if (retval)
-		return;
+		goto error;

  	uuid_unparse(ctx->fs->super->s_uuid, uuid);
  	sprintf(db->tdb_fn, "%s/%s-dirinfo-XXXXXX", tdb_dir, uuid);
@@ -74,7 +74,7 @@ static void setup_tdb(e2fsck_t ctx, ext2_ino_t num_dirs)
  	umask(save_umask);
  	if (fd < 0) {
  		db->tdb = NULL;
-		return;
+		goto error;
  	}

  	if (num_dirs < 99991)
@@ -83,6 +83,11 @@ static void setup_tdb(e2fsck_t ctx, ext2_ino_t num_dirs)
  	db->tdb = tdb_open(db->tdb_fn, num_dirs, TDB_NOLOCK | TDB_NOSYNC,
  			   O_RDWR | O_CREAT | O_TRUNC, 0600);
  	close(fd);
+
+error:
+	if(tdb_dir) {
+		free(tdb_dir);
+	}
  }
  #endif

-- 
2.23.0